Production of plant growth regulators by some Fusarium species.

About 10 species of Fusarium were screened and tested for their growth regulatory activity on oat coleoptile straight growth test. Culture filtrates of four species contained growth-stimulating factors while others showed growth-inhibition responses on oat sections. On the whole, F. moniliforme was found to be produce higher stimulatory effects. Chromatographic analysis revealed the presence of several indole auxin and gibberellin-like plant-growth regulators in their culture filtrates. The quantity and biological activity of each indole spot was also measured.